Copying an angle and constructing a bisector
Answers are for parents and teachers.
1
An angle equal to the sum of 40° and 15°?
55
2
Bisect a 120° angle; write each resulting angle (degrees).
60
3
Bisecting 90° three times in a row gives an angle of (degrees)?
11.25°
4
Construct an equilateral triangle to get 60°. Write the steps.
Draw segment AB, draw circles of radius AB centred at A and B; join their intersection C to A and B.
5
Why does “an arbitrary angle cannot be trisected” refer only to compass and straightedge?
With other tools (e.g. a protractor) or approximate methods it can be done.